#include "itoa.h"

/*
 * The heapless_itoa function is copied from the shellmatta project.
 */

/**
 * @brief           itoa like function to convert int to an ascii string
 * @warning         you have to provide a large enough buffer
 * @param[in]       value
 * @param[in,out]   buffer
 * @param[in]       base
 * @return          number of bytes in string
 */
uint32_t heapless_itoa(int32_t value, char *buffer, uint32_t base)
{
    char tempBuffer[34u];
    uint32_t i;
    uint32_t bufferIdx = 0u;
    int8_t digitValue;

    /** -# check the base for plausibility */
    if((base >= 2) && (base <= 16))
    {
        /** -# check for sign */
        if(value < 0)
        {
            value       = value * (-1);
            buffer[0u]  = '-';
            bufferIdx   += 1u;
        }

        /** -# loop through all digits in reverse order */
        i = 0u;
        do
        {
            digitValue = (int8_t) (value % base);
            tempBuffer[i] = (digitValue < 10) ? ('0' + digitValue) : ('A' + (digitValue - 10));
            value /= base;
            i ++;
        }while(value > 0);

        /** -# store the string in the correct order onto the buffer */
        while(i > 0u)
        {
            buffer[bufferIdx] = tempBuffer[i - 1u];
            i --;
            bufferIdx ++;
        }
    }
    return bufferIdx;
}